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Do-It-Yourself (DIY) Question & Answer Forum
Discrimination for single-phase residential
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<blockquote data-quote="DonkeyDong" data-source="post: 22634" data-attributes="member: 156"><p>Hi there,</p><p></p><p>I'll have a go (and be shot down) ; -)</p><p></p><p>You're break rating (4.5KA, 6KA, 9KA) doesn't come into discrimation (in simplicistic terms) - that is purely for the maximum fault current.</p><p></p><p>To ensure discrimation on MCBs, it is down to the tripping characteristics B/C/D (and their associated rating) - Although depending on the ratings/type of MCBs it can be very difficult/impossible to catagorically ensure you have discrimation - especially in domestic situations</p><p></p><p>Refer to the Appendix in the big red book for the tripping characteristics of MCBs</p><p></p><p>D.</p></blockquote><p></p>
[QUOTE="DonkeyDong, post: 22634, member: 156"] Hi there, I'll have a go (and be shot down) ; -) You're break rating (4.5KA, 6KA, 9KA) doesn't come into discrimation (in simplicistic terms) - that is purely for the maximum fault current. To ensure discrimation on MCBs, it is down to the tripping characteristics B/C/D (and their associated rating) - Although depending on the ratings/type of MCBs it can be very difficult/impossible to catagorically ensure you have discrimation - especially in domestic situations Refer to the Appendix in the big red book for the tripping characteristics of MCBs D. [/QUOTE]
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Discrimination for single-phase residential
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